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Search Results: 1 - 10 of 67109 matches for " Tabosa José Nildo "
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Estresse salino em plantulas de milho: parte II distribui??o dos macronutrientes cati?nicos e suas rela??es com sódio
Azevedo Neto, André Dias de;Tabosa, José Nildo;
Revista Brasileira de Engenharia Agrícola e Ambiental , 2000, DOI: 10.1590/S1415-43662000000200006
Abstract: the work was performed in the greenhouse, aiming to evaluate the effect of salt stress on distribution of nutrients in different parts of maize cultivars differing in their tolerance to salinity. the experiment was carried out on 2 x 5 factorial arrangement with two maize cultivars (p-3051 and br-5011) and five sodium chloride levels in nutrient solution (0, 25, 50, 75 or 100 mol m-3). salt stress increased na+ content and decreased k+ content in all plant parts. na+ content was higher in stalk and sheath than in leaf blade tissue. ca++ content decreased in root, stalk and leaf blade while mg++ content decreased only in root and in stalk tissue. root ca++ content in the cultivar p-3051 under 100 mol m-3 nacl was 60% higher than in the cultivar br-5011. the salt treatment increased na+/k+, na+/ca++ and na+/mg++ ratios in all plant parts, and the increment was higher in the p-3051 than in the br-5011 cultivar.
Estresse salino em plantulas de milho: parte I análise do crescimento
Azevedo Neto, André Dias de;Tabosa, José Nildo;
Revista Brasileira de Engenharia Agrícola e Ambiental , 2000, DOI: 10.1590/S1415-43662000000200005
Abstract: the work was performed in the greenhouse, aiming to evaluate the effect of salt stress on maize cultivars differing in salinity tolerance. data were carried out on 2 x 5 factorial arrangement with two maize cultivars (p-3051 and br-5011) and five sodium chloride levels in nutritive solution (0, 25, 50, 75 or 100 mol m-3). the shoot dry matter, root dry matter, shoot to root ratio, leaf area (la), absolute growth rate (agr), relative growth rate (rgr), net assimilation rate (nar) and leaf area ratio (lar) were analyzed. the salt stress affected all studied variables, except lar. the shoot dry matter, root dry matter, la, agr and rgr were the best parameters to express the salt stress effect on maize plants. on the other hand, the shoot to root ratio, nar and the lar were the best parameters to express differences between cultivars regarding their tolerance or sensitivity to salt stress.
Avalia??o de dez linhagens e seus híbridos de milho superdoce em um dialelo completo
Lemos, Margarida Agostinho;Gama, Elto Eugênio G.;Menezes, Dimas;Santos, Venézio Felipe dos;Tabosa, José Nildo;
Horticultura Brasileira , 2002, DOI: 10.1590/S0102-05362002000200009
Abstract: in 1996/97, 45 single cross supersweet maize hybrids, from a complete diallel cross involving ten inbred lines (s4) and their parents, were evaluated at pesqueira and vitória de santo ant?o, brazil. a látice 7 x 8 design was used with two replications for each location. the general (gca) and specific (sca) combining ability effects and heterosis value were estimated for husked ear weight (hew), unhusked ear weight (uew) and ear rate (er = uew/hew x 100). the general and specific combining ability effects were significant (p<0.01) for all characteristics. inbreds l5 = 76.5%; l7 = 71.2% and l4 = 69.6% (pesqueira); l4 = 70.8%; l5 = 69.4% and l7 = 65.3% (vitória de santo ant?o) showed the highest (er), and the highest gca effects at both locations. the best crosses for er were: l4 x l8 = 74.9% (pesqueira) and l7 x l8 = 70.3% (vitória de santo ant?o), with the highest sca effects at both locations. for er, heterosis values related to parental mean ranged from -20.19 to 24.01% (pesqueira) and -18.02 to 16.76% (vitória de santo ant?o). heterosis values related to the higher yielding parent ranged from -23.52 to 22.99% (pesqueira) and -22.05 to 12.03% (vitória de santo ant?o).
Caracteriza o e diversidade genética do capim-elefante e seus híbridos com milheto mediante padr es isoenzimáticos
FREITAS NARA SUZY AGUIAR DE,FALC?O T?NIA MARIA MUNIZ DE ARRUDA,BURITY HéLIO ALMEIDA,TABOSA JOSé NILDO
Pesquisa Agropecuária Brasileira , 2000,
Abstract: Foram avaliadas isoenzimaticamente sete cultivares de capim-elefante (Pennisetum purpureum) e seus híbridos com milheto (P. americanum), selecionados pela Empresa Pernambucana de Pesquisa Agropecuária (IPA), visando à identifica o de acessos. Foram estudados, em gel de poliacrilamida, os sistemas peroxidase (POX), esterase (EST), glutamato oxalacetato transaminase (GOT), leucina aminopeptidase (LAP), álcool-desidrogenase (ADH) e fosfatase ácida (ACP), em folhas jovens, aos 28 dias após o corte de uniformiza o. N o foi observada atividade isoenzimática da ADH e observou-se baixa resolu o do sistema LAP, os quais n o s o indicados para caracteriza o dos germoplasmas. Os padr es de ACP, GOT, POX e EST permitiram conhecer os fenótipos dos 14 acessos estudados. Foram revelados 9, 3, 13 e 19 diferentes padr es de bandas, respectivamente, sendo possível a identifica o da cole o de forma rápida e segura utilizando apenas os padr es de esterase.
Comportamento de linhagens de sorgo forrageiro submetidas a déficit hídrico sob condi o controlada
Amaral Sérgio Ribeiro do,Lira Mário de Andrade,Tabosa José Nildo,Santos Mércia Virginia Ferreira dos
Pesquisa Agropecuária Brasileira , 2003,
Abstract: O objetivo deste trabalho foi avaliar os efeitos do estresse hídrico no estabelecimento, desenvolvimento e na taxa de sobrevivência de 11 linhagens de sorgo forrageiro em casa de vegeta o. O delineamento experimental foi o de blocos ao acaso no arranjo de parcelas subdivididas no tempo, com cinco repeti es. As unidades experimentais foram constituídas por recipientes de 250 L, onde foram colocados 187,9 kg de solo da classe textural areia franca. O estudo compreendeu dois períodos de estresse, e três irriga es, sendo uma no início e as outras aplicadas quando grande número de folhas tinham aspecto de palha seca. No primeiro período, as linhagens apresentaram alta taxa de sobrevivência, demonstrando resistência ao estresse hídrico. As linhagens que apresentaram menor velocidade de crescimento nesse período sofreram menos com o estresse. No segundo período n o ocorreram diferen as significativas entre as linhagens com rela o ao desenvolvimento das plantas. Durante os dois períodos de estresse, a velocidade de crescimento n o diferenciou satisfatoriamente linhagens de comportamento distintos, quanto à resistência à seca, competindo em um mesmo recipiente e em alta densidade populacional. As linhagens 84, 29, 99, 41, 63 e 104 apresentaram maior resistência ao estresse hídrico e as linhagens 33, 38, 40, 67 e 92, menor resistência.
Identifica??o de fontes de resistência de milho à Spodoptera frugiperda (J. E. Smith, 1797) (Lepidoptera: Noctuidae) em campo
Silva, Deise Maria P. da;Oliveira, José V. de;Tabosa, José Nildo;Barros, Reginaldo;Santos, Elton O. dos;Azevedo, Simone S.;
Brazilian Archives of Biology and Technology , 2000, DOI: 10.1590/S1516-89132000000300015
Abstract: the objective of this work was to identify sources of resistance to spodoptera frugiperda (j. e. smith) in six corn cultivars (cms-22, cms-35, ag-106, dina-70, ag-510 and cms-36) which were tested under field conditions using a complete randomized block design with four replications. the following parameters were observed: a) foliar damage, obtained through a visual note scale; b) larvae survival, weigth and length, measured 10 days after artificial plant infestation. there were significant statistical differences (p=0.05) among cultivars only in relation to foliar damage, being ag 510 the most resistant cultivar with an average damage of 5.41. the most susceptible cultivars were cms 35 and ag 106 which had an average damage of 8.38 and 7.85 respectively. significant linear correlations (p=0.01) were found between foliar damage and larvae weigth; foliar damage and larvae length; and larvae weigth and larvae length, indicating the possibility of utilization of these parameters to evaluate resistance of corn cultivars to s. frugiperda.
Identifica??o de fontes de resistência em cultivares de milho à spodoptera frugiperda (J. E. Smith, 1797) em casa-de-vegeta??o
Silva, Deise Maria P. da;Oliveira, José V. de;Tabosa, José Nildo;Barros, Reginaldo;Santos, Elton O. dos;Azevedo, Simone S.;
Brazilian Archives of Biology and Technology , 1999, DOI: 10.1590/S1516-89131999000100014
Abstract: two experiments were conducted in a greenhouse, with the objective of identifying sources of resistance in 15 corn cultivars to spodoptera frugiperda. the following cultivars were utilized cms-35 , cms-36, dina-70, cargill-525, pioneer-3210, pioneer-6875, br-201, br-451, ag-106, ag-510, cms-22, contimax-322, br-201, jatin? c3 an?o, cargill-511 e br-106. when the plants had 8 to 10 leaves they were infested with 30 newly ecloded larvae per plant. damage evaluation was made 10 to 14 days after infestation, in both experiments, using a visual note scale from 0 to 9. there were no statistical differences among cultivars for the parameters evaluated damage, weight, length and survival larvae. nevertheless a significant linear correlation was found between weigth x larvae length (n = 0,7776, p = 0,01), demonstrating that these parameters can be utilized in the study of corn resistence to s. frugiperda.
Adaptabilidade e estabilidade de cultivares de milho no Nordeste brasileiro
Carvalho, Hélio Wilson Lemos de;Cardoso, Mílton José;Leal, Maria de Lourdes da Silva;Santos, Manoel Xavier dos;Tabosa, José Nildo;Souza, Evanildes Menezes de;
Pesquisa Agropecuária Brasileira , 2005, DOI: 10.1590/S0100-204X2005000500008
Abstract: forty six maize cultivars were evaluated during two years in 11 different places of brazilian northeast region. trials were carried out during the biennium 2001/2002 using experimental randomized block design, three repetitions, in order to know the adaptability and stability for cultivars recommendation. it was verified that the cultivars showed differentiated behavior among themselves in the mean of environments. the magnitude of the variance for local x cultivars interaction was more expressive than cultivars x years interaction, which suggests that the evaluations have to be done in a larger number of environments. evaluated cultivars differed in adaptability and stability, and are very important for brazilian northeast region.
Nutritive value of diferents silage sorghum (Sorghum bicolor L. Moench) cultivares
Borba, Luis Felipe Pereira;Ferreira, Marcelo de Andrade;Guim, Adriana;Tabosa, José Nildo;Gomes, Luiz Henrique dos Santos;Santos, Viviany Lúcia Fernandes dos;
Acta Scientiarum. Animal Sciences , 2012, DOI: 10.4025/actascianimsci.v34i2.12853
Abstract: nutrition values of silages from different sorghum cultivars are evaluated. five 26-kg castrated crossbred lambs, housed in pens equipped with feces and urine collectors for the study of their metabolism, were employed in a 5 x 5 latin square experimental design. treatments consisted of silage from five different sorghum cultivars: ipa 1011 and ipa 2564 (grain sorghum), ipa 2502 (dual purpose sorghum), ipa fs-25 and ipa 467 (forage sorghum). protein level was corrected to 12% by adding a mixture of urea: ammonium sulfate (9:1). treatments ipa 1011, ipa 2564 and ipa 2502 provided high intake of dry matter, total carbohydrate and total digestible nutrients, and low intake of neutral detergent fiber. cultivars ipa 1011 and ipa 2564 provided high apparent crude protein digestibility coefficient, whereas cultivars ipa 1011 and ipa 2564 had high total digestible nutrient levels. all cultivars provided positive nitrogen. owing to nutrient intake and digestibility values, grain sorghum silages evidenced high potential in ruminant nutrition.
Emergência em campo de híbridos simples de milho superdoce de um cruzamento dialélico
Lemos, Margarida Agostinho;Gama, Elto Eugênio G.;Menezes, Dimas;Santos, Venézio Felipe dos;Tabosa, José Nildo;Morais, Maria da Salete L.;
Horticultura Brasileira , 2002, DOI: 10.1590/S0102-05362002000200007
Abstract: to identify single crosses hybrids of supersweet maize of high seed germination in 1996/97, 45 single crosses and 10 inbred lines were evaluated (s4), from a complete diallel cross, at pesqueira and vitória de santo ant?o, brazil. a lattice 7 x 8 design was used with two replications, per each location. the general (gca) and specific (sca) combining ability effects were estimated for the trait stand. in the combined analysis of variance, lines, hybrids and both gca and sca effects were significant (p<0.01). the interactions of gca and sca (p<0.01) were significant with the locations. for the individual analysis, the mean squares estimates for lines, hybrids, gca and sca were also significant (p<0.01). the relative magnitude of gca and sca mean squares indicated predominance of additive gene effects. the average mean seed germination were of 40.4% and 56.5% at pesqueira and vitória de santo ant?o, respectively. the hybrids l3 x l6 and l3 x l7 at pesqueira and l1 x l10 and l3 x l5 at vitória de santo ant?o, were the most favorable single crosses of high quality seed having good field emergence potential.
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